1161044781 has 32 divisors (see below), whose sum is σ = 1699391232. Its totient is φ = 700738560.

The previous prime is 1161044771. The next prime is 1161044789. The reversal of 1161044781 is 1874401611.

It is not a de Polignac number, because 1161044781 - 2⁵ = 1161044749 is a prime.

It is a super-2 number, since 2×1161044781² = 2696049966974675922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161044789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1410336 + ... + 1411158.

It is an arithmetic number, because the mean of its divisors is an integer number (53105976).

Almost surely, 2^1161044781 is an apocalyptic number.

It is an amenable number.

1161044781 is a deficient number, since it is larger than the sum of its proper divisors (538346451).

1161044781 is a wasteful number, since it uses less digits than its factorization.

1161044781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 1161044781 is about 34074.1071929992. The cubic root of 1161044781 is about 1051.0329309198.

The spelling of 1161044781 in words is "one billion, one hundred sixty-one million, forty-four thousand, seven hundred eighty-one".